Description Specifications Description The TSI IAQ-Calc™ Indoor Air Quality Meter 7515 is ideal for investigating and monitoring indoor air quality. The Model 7515 is a cost-effective meter for carbone dioxide (CO2) measurement.Items Included: Instrument Hard carrying-case (4) AA alkaline batteries Operation and service manual NIST calibration certificate State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Product Specifications CO2 Sensor Type:Dual-wavelength NDIR Range:0 to 5,000 ppm Accuracy:±3.0% of reading or ±50 ppm, whichever is greater Resolution:1 ppm Response Time:20 seconds Literature & Docs Accessories